Number of Cobalt isotopes

Not too many people know that Cobalt (Co) is composed of 1 stable isotope, 59Co. Needless to say, 28 radioisotopes have been characterized with the most stable being 60Co with a half-life of 5.2714 years,57Co with a half-life of 271.79 days, 56Co with a half-life of 77.27 days, and 58Co with a half-life of 70.86 days. It is important to know that radioactive isotopes can be produced by various nuclear reactions. It is widely known the fact that Cobalt-60 (Co-60 or 60Co) is a radioactive metal that is used in radiotherapy.